MongoDB C100DBA MongoDB Certified DBA Associate Exam Practice Test

The oplog (operations log) is a special capped collection that keeps a rolling record of all operations that modify the data stored in your databases. All the replica set members contain a copy of the oplog in the following collection:

Which mongodb tool is used to report details on number of database operations in MongoDB?

In a sharded replica set environment, the w Option provides ability for write concern and j Option provides ability for the data to be written on disk journal. Consider that we have a seven member replica set and we want to assure that the writes are committed to journal. What should be the value of j?

The oplog (operations log) is a special capped collection that keeps a rolling record of all operations that modify the data stored in your databases. All the replica set members contain a copy of the oplog in the following collection:

What is the maximum size of Index Key Limit and Number of Indexes per collection?

Consider the following posts document:

Which of the following queries will return the documents but with only the first two tags in the tags array?

As per the aggregation pipeline optimization concepts, if you have a $sort followed by a $match: